Multi link BLE HID connection

[Anatolii]

Hello, I make multii-link peripheral device with 3 BLE HID connections. I extend heap and stack to 16kb and set properties RAM_START=0x20004000 RAM_SIZE=0x3c000. As the base project I take ble_app_hids_keyboard from examples.

1.When I try to connect this device to PC its connect and its fail with Error_code 0x3204 when void identities_set(pm_peer_id_list_skip_t skip) function is calling.

2. Device is fail when it go to sleep mode with Error_code 0x2006

What is the reason of this errors and how to fix them?

My mcu is nrf52840.

Best regards Anatolii

[ovrebekk]

Hi Anatolii

I believe this might be related to the issue discussed here:
https://devzone.nordicsemi.com/f/nordic-q-a/65747/multi-peripheral-bonding-and-whitelisting

To paraphrase that case, this error means that the device identities list is currently in use, and can't be changed.

If you at that point in time is scanning or advertising, this return value is expected. To work around this, you need to stop scanning and advertising, then call pm_device_identities_list_set(), and then resume scanning or advertising. 

Best regards
Torbjørn

[Anatolii]

Hello. I have a questions:
1. Can you say where i have to stop advertising, call pm_device_identities_list_set(), and start advertising?
2.device connect and disconnect all the time. What it could be?
3.Device is fail when it go to sleep mode with Error_code 0x2006. What it could be?

Best regards
Anatolii

[ovrebekk]

Hi

1. It is probably easiest if you stop advertising after establishing a new connection, and then wait until the call to pm_device_identities_list_set() happens, and then restart advertising again. 

2. There could be many reasons for this. What is the disconnect reason reporter in the disconnected event?

3. Can you show me the code you use to enter sleep?

Best regards
Torbjørn

[Anatolii]

Hello, thank you for answers
I rewrite some parts of the program with  whitelist counter and issue with rapid connect/disconnect disappear.
Sleep mode issue.
I take project ble_app_hids_keyboard from examples and i don't do any changes in functions

[ovrebekk]

Hi

My bad, I forgot that this is a known issue:

The system OFF sleep mode is not supported in debug mode (since entering system OFF would disconnect the debug interface), so if you try to enter system OFF through the SoftDevice when you are in debug mode it will return this error. 

If you build the release build and flash the board it should run fine without the debugger, and should not crash when entering sleep. 

Can you give this a go?

Best regards
Torbjørn